Tigerrig SJ Series Metal Sealed Bearing Bit
Features：
1.Cutting Structure
The wear-resistance of teeth is enhanced with premium tungsten carbide hard facing on the tooth surfaces for steel tooth bit. The durability of premium tungsten carbide inserts is improved with new formulas and new techniques for insert bit.
2.Gauge Structure
Multiple gauge protection with gauge trimmers on the heel and gauge inserts on the gauge surface of the cone, tungsten carbide inserts and hard facing on the shirttail increases gauge holding capability and bearing life.
3.Bearing Structure
High precision journal bearing with two thrust faces. Balls lock the cone. Hard faced head bearing surface. Cone bearing inlaid with friction-reducing alloy and then silver-plated. Abrasion resistance and seizure resistance of the bearing are improved, and suitable for high rotary speed.
4.Seal And Lubrication
The advanced metal seal package consists of two metal seals and two elastic energizers. Compressed energizers ensure good contact being kept on two sealing surfaces of metal rings by elastic force, and achieve the bearing seal. In the drilling, metal seals are relatively dynamic, and the energizers are static. This will improve the reliability and durability of bearing seal. The pressure compensator system and advanced grease can greatly increase the lubricating reliability.
5.Production Application
It is suitable for downhole motor and highspeed applications.
Current Availability
Bit size
Bit type
in
Mm
7 7/8
200.0
SJ517G、SG527G、SJ547GY、SJ617GY、SG627GY、SJ627G、SJ637GY
8 1/2
215.9
SJT117GW、SJT127GW、SJT437GK、SJT447GK、SJT517G、SJT537G、SJT617GY、SJT627G、SJT637GY
9 1/2
241.3
SJT117GW、SJT127GW、SJT437GK、SJT517G、SJT537G、SJT547G、SJT617GY
12 1/4
311.1
SJT117GW、SJT127GW、SJT437G、SJT517G、SJT537G、SJT617GY、SJT627G、SJT637GY
17 1/2
444.5
SJT117GW、SJT127GW、SJT517G、SJT537G、SJT537G、SJT617GY、SJT627G、SJT637GY
Recommended Drilling Parameters
IADC
WOB
(KN/mm) (Bit Dia.)
RPM(r/min)
Applicable Formation
117
0.35-0.8
240-80
Very soft formations with low compressive strength and high drill ability, such as clay, mudstone , chalk, etc.
127
0.35-0.9
240-70
Soft formation with low compressive strength and high drill ability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc.
437 447
Very soft formations with low compressive strength and high drill ability, such as clay, mudstone , salt, soft shale, soft limestone, etc.
517 527
0.35-1.0
220-60
537 547
0.45-1.0
220-50
Soft to medium formations with low compressive strength, such as medium soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and adrasiver interbed, etc.
617 627
0.45-1.1
200-50
Medium hard formations with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc.
637
0.5-1.1
180-40
Hard formation with high compressive strength, such as sandstone, limestone, dolomite, anhydrite. marble, etc.